/**
 * Copyright 2000 self.com.au
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License. (http://www.apache.org/licenses/LICENSE-2.0)
 *
 * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed 
 * on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for 
 * the specific language governing permissions and limitations under the License.
 *
 * <dhamma-message src="Atisha (11th century Tibetan Buddhist master)">
 * 	The greatest achievement is selflessness. The greatest worth is self-mastery.
 * 	The greatest quality is seeking to serve others. The greatest precept is continual awareness.
 * 	The greatest medicine is the emptiness of everything. The greatest action is not conforming with the worlds ways.
 * 	The greatest magic is transmuting the passions. The greatest generosity is non-attachment.
 * 	The greatest goodness is a peaceful mind. The greatest patience is humility.
 * 	The greatest effort is not concerned with results. The greatest meditation is a mind that lets go.
 * 	The greatest wisdom is seeing through appearances. 
 * </dhamma-message>
 *
 * @author Ashin Wimalajeewa
 */
package self.amigo.tool;

import java.io.*;
import java.util.*;
import javax.swing.*;

import self.awt.*;
import self.gee.editor.*;

import self.amigo.editor.cmd.*;
import self.amigo.io.*;
import self.amigo.module.*;

public class SelectionManager {
  private AgileModelingShell      shell;
  private IDiagramEditor          editor;
  
  private JMenuItem               editCutItem;
  private JMenuItem               editCopyItem;
  private JMenuItem               editPasteItem;
  private JMenuItem               editDeleteItem;
  private JMenuItem               editSelectAllItem;
  
  private List                    currentSelections;
  
  public SelectionManager( AgileModelingShell sh, IDiagramEditor ed, List selections ) {
    shell = sh;
    editor = ed;
    currentSelections = selections;
  } 
  
  public void initMenus( IEditingHost host ) {
    editCutItem  = (JMenuItem) host.getValue( IEditingHost.EDIT_CUT_MI_KEY );
    editCopyItem = (JMenuItem) host.getValue( IEditingHost.EDIT_COPY_MI_KEY );
    editPasteItem = (JMenuItem) host.getValue( IEditingHost.EDIT_PASTE_MI_KEY );
    editDeleteItem = (JMenuItem) host.getValue( IEditingHost.EDIT_DELETE_MI_KEY );
    editSelectAllItem = (JMenuItem) host.getValue( IEditingHost.EDIT_SELECT_ALL_MI_KEY );
  }
  
  public void resetMenus( int count ) {
    boolean enableSelectionBasedOps = ( count > 0 );
    editCutItem.setEnabled( enableSelectionBasedOps );
    editCopyItem.setEnabled( enableSelectionBasedOps );
    editDeleteItem.setEnabled( enableSelectionBasedOps );
    
    editSelectAllItem.setEnabled( editor.getSource().getContext().getElementCount() > 0 );
  }
  
  public void activateMenus( boolean activate ) {
    editCutItem.setEnabled( false );
    editCopyItem.setEnabled( false );
    editDeleteItem.setEnabled( false );

    editPasteItem.setEnabled( activate );
    editSelectAllItem.setEnabled( activate );
  }
  
  public void     cut() throws IOException {
    copy();
    shell.delete();
  }
  
  public void     copy() throws IOException {
    Writer wrt = ClipboardUtils.createClipboardWriter();
    try {
      ElementSelectionWriter esw = new ElementSelectionWriter( wrt );
      esw.writeSelection( currentSelections );
    } finally {
      wrt.close();
    }
  }
  
  public void     paste() throws IOException {
    ICommand cmd = new ClipboardPaste( editor, currentSelections );
    editor.executeCommand( ICommand.ET_EXECUTE, cmd ); 
//    Reader rdr = ClipboardUtils.createClipboardReader();
//    try {
//      ElementSelectionReader esr = new ElementSelectionReader( rdr );
//      esr.readSelection( editor.getSource().getContext() );
//    } finally {
//      rdr.close();
//    }
  }
  
  public void delete() {
//    ICommand cmd = new SelectionDeletion( editor, currentSelections );
    ICommand cmd = new SelectionDeletion( editor );
    editor.executeCommand( ICommand.ET_EXECUTE, cmd ); 
  }
}